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Warming and earlier spring increase Western U.S. forest wildfire activity

Science

By:
, , , and
DOI: 10.1126/science.1128834

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Abstract

Western United States forest wildfire activity is widely thought to have increased in recent decades, yet neither the extent of recent changes nor the degree to which climate may be driving regional changes in wildfire has been systematically documented. Much of the public and scientific discussion of changes in western United States wildfire has focused instead on the effects of 19th- and 20th-century land-use history. We compiled a comprehensive database of large wildfires in western United States forests since 1970 and compared it with hydroclimatic and land-surface data. Here, we show that large wildfire activity increased suddenly and markedly in the mid-1980s, with higher large-wildfire frequency, longer wildfire durations, and longer wildfire seasons. The greatest increases occurred in mid-elevation, Northern Rockies forests, where land-use histories have relatively little effect on fire risks and are strongly associated with increased spring and summer temperatures and an earlier spring snowmelt.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Warming and earlier spring increase Western U.S. forest wildfire activity
Series title:
Science
DOI:
10.1126/science.1128834
Volume
313
Issue:
5789
Year Published:
2006
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Science
First page:
940
Last page:
943